Since becoming the most talked-about member of the reality TV’s first family, Caitlyn has turned into a seriously sassy woman. “She’s a little rude and arrogant and very short-tempered,” dishes the insider. “Ironically, those are all the qualities that Caitlyn couldn’t stand in her ex-wife Kris [Jenner].”

Photo courtesy of I Am Cait from E!

And with Caitlyn about to be thrust even further into the limelight, thanks to her docuseries, I Am Cait—for which she reportedly received a $5 million payday—the source fears she won’t be changing for the better.

“She’s become difficult to work with, holding up production because she’s obsessing over her face or her Twitter account.” The reality star is also so protective of her nails that she reportedly had her Malibu pad renovated to ensure she doesn’t break them: “The toilets flush themselves, and the light switched have larger buttons,” says the source.

Scenes are shown of the 65-year-old looking out from her Malibu home in a pink gown explaining, “I am telling my story—people don’t understand looking into the mirror and nothing seems right… this is about getting to be who you really are.”

Watch the sneak peek on Star of the I Am Cait docuseries that will premiere on July 26 at 9/8c.